1. Wave length

Most nail polish lamps are dual-wavelength, with two wavelengths.

For the wavelengths of 365, 370, and 375 (or you can say between 365 and 375), they are actually the same. There is no fixed value; it is an interval.

For the wavelengths of 395, 400, and 405 (or between 395 and 405), they are also the same. There is no fixed value; it is an interval.

That is to say

If the wavelengths are written as 365 + 395, 370 + 395, 375 + 400, 365 + 405, etc., they are actually all of the same kind.

If the 415 wavelength appears, it indicates a different specification. There is no distinction of good or bad; or there is no such thing as good or bad. It simply refers to different applications and different light bulbs.

2. Diode

The light bulb is a diode, and a diode is a light bulb.

3.The material on the light bulb

All the nail polish lamps are made with epoxy resin as the material for covering the lamp beads.

That is to say, on the lamp beads themselves.